It had been supposed by Dr. Livingstone that the waters of Tanganyika Lake had outlet northward, and that they were, therefore, a part of the necessarily vast sources of the great river of the continent whose annual inundations are among the most wonderful illustrations in nature of the more than majestic power of Almighty God. His many discoveries of great lakes and rivers far to the westward of Tanganyika, their evident connection in a system, similar to that of the great lakes of North America at last forming the St. Lawrence river, flowing northward; the natural necessity there is for immense sources of supply to the Nile--these and other considerations left the explorer to imagine that Tanganyika formed a part of the same system with that lake which he named after an illustrious President of the United States. The commander of the “Herald” expedition, therefore, with a fine appreciation of the situation, offered his escort to Dr. Livingstone, with a proposal to accompany him to the head of the lake. The offer was accepted, and the explorer, as Mr. Stanley says, “like a hero, lost no time in starting.” The account of this journey, or voyage, rather, for the party travelled by boat, is given in a dispatch dated December 23, 1871, at Ujiji. It is as follows: “On the 20th of November Dr. Livingstone and your correspondent, with twenty picked men of the HERALD Expedition Corps, started. Despite the assertion of Arabs that the Warundi were dangerous and would not let us pass, we hugged their coast closely, and when fatigued boldly encamped in their country. Once only were we obliged to fly--and this was at dead of night--from a large party which we knew to be surrounding us on the land side. We got to the boat safely, and we might have punished them severely had the Doctor been so disposed. Once also we were stoned, but we paid no heed to them and kept on our way along their coast until we arrived at Mokamba’s, one of the chiefs of Usige. Mokamba was at war with a neighboring chief, who lived on the left bank of the Rusizi. That did not deter us, and we crossed the head of the Tanganyika to Mugihewah, governed by Ruhinga, brother of Mokamba. “Mugihewah is a tract of country on the right bank of the Rusizi, extending to the lake. With Mokamba and Ruhinga we became most intimate; they proved to be sociable, good-natured chiefs, and gave most valuable information concerning the countries lying to the north of Usige; and if their information is correct, Sir Samuel Baker will be obliged to curtail the ambitious dimensions of his lake by one degree, if not more. A Mgwana, living at Mokamba’s, on the eastern shore of the lake, had informed us that the River Rusizi certainly flowed out of the lake, and after joining the Kitangule emptied into the Lake Nyanza (Victoria).